1 files changed, 81 insertions, 0 deletions
diff --git a/platform/default/src/mbgl/storage/asset_file_source.cpp b/platform/default/src/mbgl/storage/asset_file_source.cpp
new file mode 100644
index 0000000000..7988654ae5
--- /dev/null
+++ b/platform/default/src/mbgl/storage/asset_file_source.cpp
@@ -0,0 +1,81 @@
+#include <mbgl/storage/asset_file_source.hpp>
+#include <mbgl/storage/file_source_request.hpp>
+#include <mbgl/storage/response.hpp>
+#include <mbgl/util/string.hpp>
+#include <mbgl/util/thread.hpp>
+#include <mbgl/util/url.hpp>
+#include <mbgl/util/util.hpp>
+#include <mbgl/util/io.hpp>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+namespace {
+
+const std::string assetProtocol = "asset://";
+
+} // namespace
+
+namespace mbgl {
+
+class AssetFileSource::Impl {
+public:
+    Impl(ActorRef<Impl>, std::string root_)
+        : root(std::move(root_)) {
+    }
+
+    void request(const std::string& url, ActorRef<FileSourceRequest> req) {
+        Response response;
+
+        if (!acceptsURL(url)) {
+            response.error = std::make_unique<Response::Error>(Response::Error::Reason::Other,
+                                                               "Invalid asset URL");
+            req.invoke(&FileSourceRequest::setResponse, response);
+            return;
+        }
+
+        // Cut off the protocol and prefix with path.
+        const auto path = root + "/" + mbgl::util::percentDecode(url.substr(assetProtocol.size()));
+        struct stat buf;
+        int result = stat(path.c_str(), &buf);
+
+        if (result == 0 && (S_IFDIR & buf.st_mode)) {
+            response.error = std::make_unique<Response::Error>(Response::Error::Reason::NotFound);
+        } else if (result == -1 && errno == ENOENT) {
+            response.error = std::make_unique<Response::Error>(Response::Error::Reason::NotFound);
+        } else {
+            try {
+                response.data = std::make_shared<std::string>(util::read_file(path));
+            } catch (...) {
+                response.error = std::make_unique<Response::Error>(
+                    Response::Error::Reason::Other,
+                    util::toString(std::current_exception()));
+            }
+        }
+
+        req.invoke(&FileSourceRequest::setResponse, response);
+    }
+
+private:
+    std::string root;
+};
+
+AssetFileSource::AssetFileSource(const std::string& root)
+    : impl(std::make_unique<util::Thread<Impl>>("AssetFileSource", root)) {
+}
+
+AssetFileSource::~AssetFileSource() = default;
+
+std::unique_ptr<AsyncRequest> AssetFileSource::request(const Resource& resource, Callback callback) {
+    auto req = std::make_unique<FileSourceRequest>(std::move(callback));
+
+    impl->actor().invoke(&Impl::request, resource.url, req->actor());
+
+    return std::move(req);
+}
+
+bool AssetFileSource::acceptsURL(const std::string& url) {
+    return 0 == url.rfind(assetProtocol, 0);
+}
+
+} // namespace mbgl